# CVE-2023-41338: GO-2023-2052 - IsFromLocal local address check can be circumvented in github.com/gofiber/fiber/v2

Source: https://junglewise.ai/threats/cve-2023-41338-fiber-unauthorized-access-vulnerability-in-ctx-isfromlocal  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-09-12  
License: CC BY 4.0 with a link back

CVE-2023-41338 · Severity: low · CVSS 3.1 · Published 2023-09-12

IsFromLocal local address check can be circumvented in github.com/gofiber/fiber/v2

Technologies: [github.com/gofiber/fiber (Go)](https://junglewise.ai/threats/technologies/github-com-gofiber-fiber), [github.com/gofiber/fiber/v2 (Go)](https://junglewise.ai/threats/technologies/github-com-gofiber-fiber-v2). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2023-41338 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2023-41338 being exploited in the wild.

**How severe is CVE-2023-41338?** Low severity, with a CVSS score of 3.1, published 12 September 2023.

**Which products and versions are affected?** github.com/gofiber/fiber (Go) SEMVER:introduced=0,last_affected=1.14.6; github.com/gofiber/fiber/v2 (Go) SEMVER:introduced=0,fixed=2.49.2, SEMVER:introduced=0,fixed=2.49.2-0.20230906112033-b8c9ede6efa2.

**Is there a fix for CVE-2023-41338?** Yes. github.com/gofiber/fiber/v2 (Go): upgrade to 2.49.2, 2.49.2-0.20230906112033-b8c9ede6efa2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2023-41338?** Check whether you run github.com/gofiber/fiber (Go) or github.com/gofiber/fiber/v2 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/gofiber/fiber/v2 (Go): upgrade to 2.49.2, 2.49.2-0.20230906112033-b8c9ede6efa2 or later

  ```sh
  go get github.com/gofiber/fiber/v2@v2.49.2-0.20230906112033-b8c9ede6efa2
  ```


## Affected products

- github.com/gofiber/fiber (Go) SEMVER:introduced=0,last_affected=1.14.6
- github.com/gofiber/fiber/v2 (Go) SEMVER:introduced=0,fixed=2.49.2, SEMVER:introduced=0,fixed=2.49.2-0.20230906112033-b8c9ede6efa2

## Identifiers

- CVE-2023-41338
- GHSA-3q5p-3558-364f
- GO-2023-2052

## Related threats

- [Fiber CORS middleware wildcard domain bypass](https://junglewise.ai/threats/cve-2026-119285-fiber-is-an-express-inspired-web-framework-written-in-go-from-2)
- [Gofiber Fiber HSTS header omission in helmet middleware](https://junglewise.ai/threats/cve-2026-53624-gofiber-fiber-hsts-header-omission-in-helmet-middleware)
- [Gofiber Fiber IP spoofing in BalancerForward proxy helper](https://junglewise.ai/threats/cve-2026-45045-gofiber-fiber-ip-spoofing-in-balancerforward-proxy-helper)
- [Go Fiber XSS in AutoFormat content negotiation](https://junglewise.ai/threats/cve-2026-42554-go-fiber-xss-in-autoformat-content-negotiation)
- [GO-2026-4543 - Fiber has a Denial of Service Vulnerability via Route Parameter Overflow in github.com/gofiber/fiber](https://junglewise.ai/threats/cve-2026-25882-fiber-has-a-denial-of-service-vulnerability-via-route-parameter)